From: Song Liu <song@kernel.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com,
andrii@kernel.org, martin.lau@linux.dev,
yonghong.song@linux.dev, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, bpf@vger.kernel.org,
Luis Gerhorst <gerhorst@cs.fau.de>
Subject: Re: [PATCH bpf-next] bpf: Inherit system settings for CPU security mitigations
Date: Thu, 5 Oct 2023 11:01:49 -0700 [thread overview]
Message-ID: <CAPhsuW70-kKGT1RQRGYG0b6zixKTzaU_-SUfvhhrwO3y_WZcBw@mail.gmail.com> (raw)
In-Reply-To: <20231005084123.1338-1-laoar.shao@gmail.com>
On Thu, Oct 5, 2023 at 1:41 AM Yafang Shao <laoar.shao@gmail.com> wrote:
>
> Currently, there exists a system-wide setting related to CPU security
> mitigations, denoted as 'mitigations='. When set to 'mitigations=off', it
> deactivates all optional CPU mitigations. Therefore, if we implement a
> system-wide 'mitigations=off' setting, it should inherently bypass Spectre
> v1 and Spectre v4 in the BPF subsystem.
>
> Please note that there is also a 'nospectre_v1' setting on x86 and ppc
> architectures, though it is not currently exported. For the time being,
> let's disregard it.
>
> This idea emerged during our discussion about potential Spectre v1 attacks
> with Luis[1].
>
> [1]. https://lore.kernel.org/bpf/b4fc15f7-b204-767e-ebb9-fdb4233961fb@iogearbox.net/
>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> Cc: Luis Gerhorst <gerhorst@cs.fau.de>
Acked-by: Song Liu <song@kernel.org>
next prev parent reply other threads:[~2023-10-05 18:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-05 8:41 [PATCH bpf-next] bpf: Inherit system settings for CPU security mitigations Yafang Shao
2023-10-05 17:24 ` Stanislav Fomichev
2023-10-05 18:01 ` Song Liu [this message]
2023-10-05 23:30 ` KP Singh
2023-10-06 16:55 ` Daniel Borkmann
2023-10-06 18:20 ` patchwork-bot+netdevbpf
2023-10-11 22:53 ` Andrii Nakryiko
2023-10-12 2:29 ` Yafang Shao
2023-10-12 4:42 ` Andrii Nakryiko
2023-10-20 0:42 ` Alexei Starovoitov
2023-10-20 2:35 ` Yafang Shao
2023-10-22 9:26 ` [PATCH bpf-next] selftests/bpf: Fix selftests broken by mitigations=off Yafang Shao
2023-10-22 9:49 ` [PATCH v2 " Yafang Shao
2023-10-22 10:05 ` Yafang Shao
2023-10-25 3:11 ` [PATCH v3 " Yafang Shao
2023-10-25 4:56 ` Yonghong Song
2023-10-26 13:46 ` Daniel Borkmann
2023-10-26 16:54 ` Yonghong Song
2023-10-26 13:50 ` patchwork-bot+netdevbpf
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